From 1e15687ea472614d48416c53bebcf213c07a5532 Mon Sep 17 00:00:00 2001
From: Chase Southwood <chase.southwood@gmail.com>
Date: Sat, 21 Jun 2014 17:25:58 -0500
Subject: [PATCH] staging: comedi: addi_apci_1564: add Change-of-State
 interrupt subdevice and required functions

This board supports an interrupt that can be generated by an AND/OR
combination of 16 of the input channels.

Create a separate subdevice to handle this interrupt.

The apci1564_di_config() function is used to configure which
inputs are used to generate the interrupt. Currently this function
is broken since it does not follow the comedi API for insn_config
functions. Fix this function by implementing the config instruction
INSN_CONFIG_DIGITAL_TRIG.

Add the remaining subdevice operations necessary for the interrupt
subdevice to support async commands.

Signed-off-by: Chase Southwood <chase.southwood@gmail.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Cc: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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